Lined Bifocal (FT28) Prescription Radiation GlassesLined bifocal prescriptions offer distance correction on the top of the lens and near, or reading, correction on the bottom of the lens. The two areas are separated by a line. The reading area is a semicircle with a flat part on top (Flat-Top) that is 28mm wide, which is where the FT28 comes from. Our FT28 prescription glasses feature our standard 0.75mm lead equivalency Schott SF-6 HT radiation safety glass lenses.

Progressive (No-Line) Bifocal Prescription Radiation GlassesProgressive prescriptions offer distance correction on the top of the lens and near, or reading, correction on the bottom of the lens. The two areas are separated by a corridor which progressively increases the reading, or near prescription strength as you look down the lens, allowing you to have intermediate correction between the distance correction and the near correction. This also makes the bifocal nature of the lens invisible; there is no line. Our progressive prescription glasses feature our standard 0.75mm lead equivalency Schott SF-6 HT radiation safety glass lenses.